Here are some interesting illusions for you to observe (as an addendum to our readings!) Can you figure out how these illusions fool your eye?
Akiyoshi Kitaoka’s image on the left is called “Out of Focus”. It also leads to a seeming shift of the central disk with respect to the surround. It is very effectively provoked by the eye movements occurring during reading. So, while you are reading this cast your “inner eye” to the left and watch for a seeming decoupling of disk and background. You may also observe that the disk floats above the background.
TRY THIS ILLUSION on your own!
The "frankfurter illusion"
If you have two roughly equivalent eyes you will see a ‘sausage’ floating in front of you in mid air, by following these steps:
Hold your hands in front of you, at 20–30 cm distance from you, at eye level.
Point your index fingers against each other, leaving about 2 cm distance between them.
Now look “trough” your fingers, into the distance behind them.
The sausage should appear now, and you can change its length by varying the distance between the finger tips.
For most observers, the sausage will look blurred, at least initially.
If you try to look at the sausage, it will disappear, it is only present if you look at something more distant than your fingers.
It helps if the background is rather homogenous and has a color very different from your fingers.
THIS ILLUSION is called Mr. Angry and Mr. Calm. Look closely. At first Mr. Angry is on the left. Yet, if you SQUINT or move away from your screen, the faces will SWITCH!
for all of these and more fun illusions (and some every more fun explanations) check out this webpage.
DON'T TRUST YOUR EYES!
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